Final answer:
The disaccharide that has an anomeric carbon available for oxidation is Glc (α1 ⇁2β) Fru. The disaccharide that has an anomeric carbon available for oxidation is sucrose.
Step-by-step explanation:
However, since sucrose is a non-reducing sugar, the correct answer is actually maltose which is a reducing sugar with a free anomeric carbon. This disaccharide, also known as sucrose, has a glucose (Glc) and a fructose (Fru) unit joined by an α1,2-glycosidic linkage.
Since sucrose does not have free anomeric carbons as both are involved in the glycosidic bond, it's actually a non-reducing sugar and does not have an anomeric carbon available for oxidation. Instead, maltose, which contains two glucose units linked by an α1→4 glycosidic linkage, does have an anomeric carbon not involved in the glycosidic linkage and it can open to form an aldehyde group, thus it is a reducing sugar and is the correct answer to the question.